X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fnfs%2Fnfs3xdr.c;h=11cdddec1432cfae1199aa2f89257ce00dd033d1;hb=41d88d55b2891203e98d1dc0acab949ffd0af078;hp=3917e2fa4e40f3e1a18c12bee149c576847d4b5f;hpb=5bdeae46be6dfe9efa44a548bd622af325f4bdb4;p=linux-2.6-omap-h63xx.git

diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index 3917e2fa4e4..11cdddec143 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -508,14 +508,14 @@ nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res
 	struct page **page;
 	size_t hdrlen;
 	u32 len, recvd, pglen;
-	int status, nr;
+	int status, nr = 0;
 	__be32 *entry, *end, *kaddr;
 
 	status = ntohl(*p++);
 	/* Decode post_op_attrs */
 	p = xdr_decode_post_op_attr(p, res->dir_attr);
 	if (status)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	/* Decode verifier cookie */
 	if (res->verf) {
 		res->verf[0] = *p++;
@@ -542,7 +542,12 @@ nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res
 	kaddr = p = kmap_atomic(*page, KM_USER0);
 	end = (__be32 *)((char *)p + pglen);
 	entry = p;
-	for (nr = 0; *p++; nr++) {
+
+	/* Make sure the packet actually has a value_follows and EOF entry */
+	if ((entry + 1) > end)
+		goto short_pkt;
+
+	for (; *p++; nr++) {
 		if (p + 3 > end)
 			goto short_pkt;
 		p += 2;				/* inode # */
@@ -581,18 +586,32 @@ nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res
 			goto short_pkt;
 		entry = p;
 	}
-	if (!nr && (entry[0] != 0 || entry[1] == 0))
-		goto short_pkt;
+
+	/*
+	 * Apparently some server sends responses that are a valid size, but
+	 * contain no entries, and have value_follows==0 and EOF==0. For
+	 * those, just set the EOF marker.
+	 */
+	if (!nr && entry[1] == 0) {
+		dprintk("NFS: readdir reply truncated!\n");
+		entry[1] = 1;
+	}
  out:
 	kunmap_atomic(kaddr, KM_USER0);
 	return nr;
  short_pkt:
+	/*
+	 * When we get a short packet there are 2 possibilities. We can
+	 * return an error, or fix up the response to look like a valid
+	 * response and return what we have so far. If there are no
+	 * entries and the packet was short, then return -EIO. If there
+	 * are valid entries in the response, return them and pretend that
+	 * the call was successful, but incomplete. The caller can retry the
+	 * readdir starting at the last cookie.
+	 */
 	entry[0] = entry[1] = 0;
-	/* truncate listing ? */
-	if (!nr) {
-		dprintk("NFS: readdir reply truncated!\n");
-		entry[1] = 1;
-	}
+	if (!nr)
+		nr = -errno_NFSERR_IO;
 	goto out;
 err_unmap:
 	nr = -errno_NFSERR_IO;
@@ -732,7 +751,7 @@ nfs3_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
 	int	status;
 
 	if ((status = ntohl(*p++)))
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	xdr_decode_fattr(p, fattr);
 	return 0;
 }
@@ -747,7 +766,7 @@ nfs3_xdr_wccstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
 	int	status;
 
 	if ((status = ntohl(*p++)))
-		status = -nfs_stat_to_errno(status);
+		status = nfs_stat_to_errno(status);
 	xdr_decode_wcc_data(p, fattr);
 	return status;
 }
@@ -767,7 +786,7 @@ nfs3_xdr_lookupres(struct rpc_rqst *req, __be32 *p, struct nfs3_diropres *res)
 	int	status;
 
 	if ((status = ntohl(*p++))) {
-		status = -nfs_stat_to_errno(status);
+		status = nfs_stat_to_errno(status);
 	} else {
 		if (!(p = xdr_decode_fhandle(p, res->fh)))
 			return -errno_NFSERR_IO;
@@ -787,7 +806,7 @@ nfs3_xdr_accessres(struct rpc_rqst *req, __be32 *p, struct nfs3_accessres *res)
 
 	p = xdr_decode_post_op_attr(p, res->fattr);
 	if (status)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	res->access = ntohl(*p++);
 	return 0;
 }
@@ -824,7 +843,7 @@ nfs3_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
 	p = xdr_decode_post_op_attr(p, fattr);
 
 	if (status != 0)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 
 	/* Convert length of symlink */
 	len = ntohl(*p++);
@@ -872,7 +891,7 @@ nfs3_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
 	p = xdr_decode_post_op_attr(p, res->fattr);
 
 	if (status != 0)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 
 	/* Decode reply count and EOF flag. NFSv3 is somewhat redundant
 	 * in that it puts the count both in the res struct and in the
@@ -922,7 +941,7 @@ nfs3_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
 	p = xdr_decode_wcc_data(p, res->fattr);
 
 	if (status != 0)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 
 	res->count = ntohl(*p++);
 	res->verf->committed = (enum nfs3_stable_how)ntohl(*p++);
@@ -953,7 +972,7 @@ nfs3_xdr_createres(struct rpc_rqst *req, __be32 *p, struct nfs3_diropres *res)
 			res->fattr->valid = 0;
 		}
 	} else {
-		status = -nfs_stat_to_errno(status);
+		status = nfs_stat_to_errno(status);
 	}
 	p = xdr_decode_wcc_data(p, res->dir_attr);
 	return status;
@@ -968,7 +987,7 @@ nfs3_xdr_renameres(struct rpc_rqst *req, __be32 *p, struct nfs3_renameres *res)
 	int	status;
 
 	if ((status = ntohl(*p++)) != 0)
-		status = -nfs_stat_to_errno(status);
+		status = nfs_stat_to_errno(status);
 	p = xdr_decode_wcc_data(p, res->fromattr);
 	p = xdr_decode_wcc_data(p, res->toattr);
 	return status;
@@ -983,7 +1002,7 @@ nfs3_xdr_linkres(struct rpc_rqst *req, __be32 *p, struct nfs3_linkres *res)
 	int	status;
 
 	if ((status = ntohl(*p++)) != 0)
-		status = -nfs_stat_to_errno(status);
+		status = nfs_stat_to_errno(status);
 	p = xdr_decode_post_op_attr(p, res->fattr);
 	p = xdr_decode_wcc_data(p, res->dir_attr);
 	return status;
@@ -1001,7 +1020,7 @@ nfs3_xdr_fsstatres(struct rpc_rqst *req, __be32 *p, struct nfs_fsstat *res)
 
 	p = xdr_decode_post_op_attr(p, res->fattr);
 	if (status != 0)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 
 	p = xdr_decode_hyper(p, &res->tbytes);
 	p = xdr_decode_hyper(p, &res->fbytes);
@@ -1026,7 +1045,7 @@ nfs3_xdr_fsinfores(struct rpc_rqst *req, __be32 *p, struct nfs_fsinfo *res)
 
 	p = xdr_decode_post_op_attr(p, res->fattr);
 	if (status != 0)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 
 	res->rtmax  = ntohl(*p++);
 	res->rtpref = ntohl(*p++);
@@ -1054,7 +1073,7 @@ nfs3_xdr_pathconfres(struct rpc_rqst *req, __be32 *p, struct nfs_pathconf *res)
 
 	p = xdr_decode_post_op_attr(p, res->fattr);
 	if (status != 0)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	res->max_link = ntohl(*p++);
 	res->max_namelen = ntohl(*p++);
 
@@ -1073,7 +1092,7 @@ nfs3_xdr_commitres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
 	status = ntohl(*p++);
 	p = xdr_decode_wcc_data(p, res->fattr);
 	if (status != 0)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 
 	res->verf->verifier[0] = *p++;
 	res->verf->verifier[1] = *p++;
@@ -1095,7 +1114,7 @@ nfs3_xdr_getaclres(struct rpc_rqst *req, __be32 *p,
 	int err, base;
 
 	if (status != 0)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	p = xdr_decode_post_op_attr(p, res->fattr);
 	res->mask = ntohl(*p++);
 	if (res->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
@@ -1122,7 +1141,7 @@ nfs3_xdr_setaclres(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
 	int status = ntohl(*p++);
 
 	if (status)
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	xdr_decode_post_op_attr(p, fattr);
 	return 0;
 }